18628447 has 4 divisors (see below), whose sum is σ = 19724256. Its totient is φ = 17532640.

The previous prime is 18628439. The next prime is 18628451. The reversal of 18628447 is 74482681.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18628447 - 2³ = 18628439 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18628147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 547879 + ... + 547912.

It is an arithmetic number, because the mean of its divisors is an integer number (4931064).

Almost surely, 2^18628447 is an apocalyptic number.

18628447 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

18628447 is a deficient number, since it is larger than the sum of its proper divisors (1095809).

18628447 is a wasteful number, since it uses less digits than its factorization.

18628447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095808.

The product of its digits is 86016, while the sum is 40.

The square root of 18628447 is about 4316.0684656293. The cubic root of 18628447 is about 265.0893112992.

The spelling of 18628447 in words is "eighteen million, six hundred twenty-eight thousand, four hundred forty-seven".